# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: hashlib.py
r"""hashlib module - A common interface to many hash functions.

new(name, data=b'', **kwargs) - returns a new hash object implementing the
                                given hash function; initializing the hash
                                using the given binary data.

Named constructor functions are also available, these are faster
than using new(name):

md5(), sha1(), sha224(), sha256(), sha384(), sha512(), blake2b(), blake2s(),
sha3_224, sha3_256, sha3_384, sha3_512, shake_128, and shake_256.

More algorithms may be available on your platform but the above are guaranteed
to exist.  See the algorithms_guaranteed and algorithms_available attributes
to find out what algorithm names can be passed to new().

NOTE: If you want the adler32 or crc32 hash functions they are available in
the zlib module.

Choose your hash function wisely.  Some have known collision weaknesses.
sha384 and sha512 will be slow on 32 bit platforms.

Hash objects have these methods:
 - update(arg): Update the hash object with the bytes in arg. Repeated calls
                are equivalent to a single call with the concatenation of all
                the arguments.
 - digest():    Return the digest of the bytes passed to the update() method
                so far.
 - hexdigest(): Like digest() except the digest is returned as a unicode
                object of double length, containing only hexadecimal digits.
 - copy():      Return a copy (clone) of the hash object. This can be used to
                efficiently compute the digests of strings that share a common
                initial substring.

For example, to obtain the digest of the string 'Nobody inspects the
spammish repetition':

    >>> import hashlib
    >>> m = hashlib.md5()
    >>> m.update(b"Nobody inspects")
    >>> m.update(b" the spammish repetition")
    >>> m.digest()
    b'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9'

More condensed:

    >>> hashlib.sha224(b"Nobody inspects the spammish repetition").hexdigest()
    'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2'

"""
__always_supported = (
    "md5",
    "sha1",
    "sha224",
    "sha256",
    "sha384",
    "sha512",
    "blake2b",
    "blake2s",
    "sha3_224",
    "sha3_256",
    "sha3_384",
    "sha3_512",
    "shake_128",
    "shake_256",
)
algorithms_guaranteed = set(__always_supported)
algorithms_available = set(__always_supported)
__all__ = __always_supported + (
    "new",
    "algorithms_guaranteed",
    "algorithms_available",
    "pbkdf2_hmac",
)
__builtin_constructor_cache = {}


def __get_builtin_constructor(name):
    cache = __builtin_constructor_cache
    constructor = cache.get(name)
    if constructor is not None:
        return constructor
    try:
        if name in ("SHA1", "sha1"):
            import _sha1

            cache["SHA1"] = cache["sha1"] = _sha1.sha1
        else:
            if name in ("MD5", "md5"):
                import _md5

                cache["MD5"] = cache["md5"] = _md5.md5
            else:
                if name in ("SHA256", "sha256", "SHA224", "sha224"):
                    import _sha256

                    cache["SHA224"] = cache["sha224"] = _sha256.sha224
                    cache["SHA256"] = cache["sha256"] = _sha256.sha256
                else:
                    if name in ("SHA512", "sha512", "SHA384", "sha384"):
                        import _sha512

                        cache["SHA384"] = cache["sha384"] = _sha512.sha384
                        cache["SHA512"] = cache["sha512"] = _sha512.sha512
                    else:
                        if name in ("blake2b", "blake2s"):
                            import _blake2

                            cache["blake2b"] = _blake2.blake2b
                            cache["blake2s"] = _blake2.blake2s
                        else:
                            if name in frozenset(
                                {
                                    "sha3_256",
                                    "shake_256",
                                    "sha3_384",
                                    "sha3_224",
                                    "shake_128",
                                    "sha3_512",
                                }
                            ):
                                import _sha3

                                cache["sha3_224"] = _sha3.sha3_224
                                cache["sha3_256"] = _sha3.sha3_256
                                cache["sha3_384"] = _sha3.sha3_384
                                cache["sha3_512"] = _sha3.sha3_512
                                cache["shake_128"] = _sha3.shake_128
                                cache["shake_256"] = _sha3.shake_256
    except ImportError:
        pass

    constructor = cache.get(name)
    if constructor is not None:
        return constructor
    raise ValueError("unsupported hash type " + name)


def __get_openssl_constructor(name):
    if name in frozenset({"blake2s", "blake2b"}):
        return __get_builtin_constructor(name)
        try:
            f = getattr(_hashlib, "openssl_" + name)
            f()
            return f
        except (AttributeError, ValueError):
            return __get_builtin_constructor(name)


def __py_new(name, data=b"", **kwargs):
    """new(name, data=b'', **kwargs) - Return a new hashing object using the
    named algorithm; optionally initialized with data (which must be bytes).
    """
    return __get_builtin_constructor(name)(data, **kwargs)


def __hash_new(name, data=b"", **kwargs):
    """new(name, data=b'') - Return a new hashing object using the named algorithm;
    optionally initialized with data (which must be bytes).
    """
    if name in frozenset({"blake2s", "blake2b"}):
        return __get_builtin_constructor(name)(data, **kwargs)
        try:
            return _hashlib.new(name, data)
        except ValueError:
            return __get_builtin_constructor(name)(data)


try:
    import _hashlib

    new = __hash_new
    __get_hash = __get_openssl_constructor
    algorithms_available = algorithms_available.union(_hashlib.openssl_md_meth_names)
except ImportError:
    new = __py_new
    __get_hash = __get_builtin_constructor

try:
    from _hashlib import pbkdf2_hmac
except ImportError:
    _trans_5C = bytes((x ^ 92 for x in range(256)))
    _trans_36 = bytes((x ^ 54 for x in range(256)))

    def pbkdf2_hmac(hash_name, password, salt, iterations, dklen=None):
        """Password based key derivation function 2 (PKCS #5 v2.0)
        
        This Python implementations based on the hmac module about as fast
        as OpenSSL's PKCS5_PBKDF2_HMAC for short passwords and much faster
        for long passwords.
        """
        if not isinstance(hash_name, str):
            raise TypeError(hash_name)
        if not isinstance(password, (bytes, bytearray)):
            password = bytes(memoryview(password))
        if not isinstance(salt, (bytes, bytearray)):
            salt = bytes(memoryview(salt))
        inner = new(hash_name)
        outer = new(hash_name)
        blocksize = getattr(inner, "block_size", 64)
        if len(password) > blocksize:
            password = new(hash_name, password).digest()
        password = password + b"\x00" * (blocksize - len(password))
        inner.update(password.translate(_trans_36))
        outer.update(password.translate(_trans_5C))

        def prf(msg, inner=inner, outer=outer):
            icpy = inner.copy()
            ocpy = outer.copy()
            icpy.update(msg)
            ocpy.update(icpy.digest())
            return ocpy.digest()

        if iterations < 1:
            raise ValueError(iterations)
        if dklen is None:
            dklen = outer.digest_size
        if dklen < 1:
            raise ValueError(dklen)
        dkey = b""
        loop = 1
        from_bytes = int.from_bytes
        while len(dkey) < dklen:
            prev = prf(salt + loop.to_bytes(4, "big"))
            rkey = int.from_bytes(prev, "big")
            for i in range(iterations - 1):
                prev = prf(prev)
                rkey ^= from_bytes(prev, "big")

            loop += 1
            dkey += rkey.to_bytes(inner.digest_size, "big")

        return dkey[:dklen]


try:
    from _hashlib import scrypt
except ImportError:
    pass

for __func_name in __always_supported:
    try:
        globals()[__func_name] = __get_hash(__func_name)
    except ValueError:
        import logging

        logging.exception("code for hash %s was not found.", __func_name)

del __always_supported
del __func_name
del __get_hash
del __py_new
del __hash_new
del __get_openssl_constructor
